diff --git a/compatibility_matrices/compatibility_matrix.mk b/compatibility_matrices/compatibility_matrix.mk
index 90713d4..14c60ab 100644
--- a/compatibility_matrices/compatibility_matrix.mk
+++ b/compatibility_matrices/compatibility_matrix.mk
@@ -14,6 +14,17 @@
 # limitations under the License.
 #
 
+###########################################################
+## Remove minor revision from a kernel version. For example,
+## 3.18.0 becomes 3.18.
+## $(1): kernel version
+###########################################################
+define remove-minor-revision
+$(strip $(subst $(space),.,$(wordlist 1,2,$(subst .,$(space),$(strip $(1))))))
+endef
+
+# $(warning $(call remove-minor-revision,3.18.0))
+
 ifndef LOCAL_MODULE_STEM
 $(error LOCAL_MODULE_STEM must be defined.)
 endif
@@ -55,10 +66,10 @@
 $(GEN): PRIVATE_KERNEL_CONFIG_DATA := kernel/configs
 $(GEN): PRIVATE_KERNEL_VERSIONS := $(LOCAL_KERNEL_VERSIONS)
 $(GEN): $(foreach version,$(PRIVATE_KERNEL_VERSIONS),\
-    $(wildcard $(PRIVATE_KERNEL_CONFIG_DATA)/android-$(version)/android-base*.cfg))
+    $(wildcard $(PRIVATE_KERNEL_CONFIG_DATA)/android-$(call remove-minor-revision,$(version))/android-base*.cfg))
 $(GEN): PRIVATE_FLAGS += $(foreach version,$(PRIVATE_KERNEL_VERSIONS),\
     --kernel=$(version):$(call normalize-path-list,\
-        $(wildcard $(PRIVATE_KERNEL_CONFIG_DATA)/android-$(version)/android-base*.cfg)))
+        $(wildcard $(PRIVATE_KERNEL_CONFIG_DATA)/android-$(call remove-minor-revision,$(version))/android-base*.cfg)))
 endif
 
 my_matrix_src_files := \
@@ -85,3 +96,5 @@
 my_matrix_src_files :=
 
 include $(BUILD_PREBUILT)
+
+remove-minor-revision :=